I would approach the problem in a simple manner

sub generate_random_string {
    my $res = '';
    $res.= chr int rand(26)+96 for 1..8;
    return $res;
}

[download]
Use this to generate a random string(with 8 letters).
After this you can just use a hash/hashref to assure no new string generated
is a duplicate with a past one

You can do this like this
my $h={};
sub generate_new_unique_random_str{
my $result;
while(exists $h->{$result=generate_random_string()}) {};
return $result;
}

[download]

The code above will store in $result each time the value returned by our
random string generator,and if it is not beeing found in the hash then
the loop terminates and the new generated value is returned

Originally posted as a Categorized Answer.

In reply to Re: How to generate a unique word or number? by spx2
in thread How to generate a unique word or number? by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.